.main1 {
    margin-top: 60px;
    width: 100%;
    position: absolute;
}

.main1 .txt {
    margin-top: 10px;
    font-weight: bold;
    font-size: 3rem;
    color: #2c3e50;
}

.main1 .txt1 {
    font-weight: 800;
    font-size: 1.6rem;
    color: #2c3e50;
}

.main1 .img {
    display: block;
    top: 0;
    width: 300px;
    height: 300px;
    position: relative;
    /* margin: -60px auto 0 auto; */
    margin: 90px auto 0 auto;
    /* padding-top: 150px; */
}

.top-navigation,
.main .main-nav,
.main .main_nav {
    background-color: #ffffff;
    position: fixed;
}

.top-navigation {
    height: 60px;
    padding: 0 20px;
    border-bottom: 1px solid #dbdcdd;
    width: 100%;
}

.top-navigation .top-left {
    float: left;
    width: 214px;
}

.top-navigation .top-right {
    float: right;
    width: 67%;
    transform: translateX(0px);
    margin-right: 44px;
}

.top-navigation .top-left img {
    width: 46px;
    height: 46px;
    padding: 7px;
    float: left;
}

.top-navigation .top-left p {
    text-align: left;
    font-size: 22px;
    line-height: 46px;
    padding: 7px 0;
    color: black;
}

.top-navigation .top-right ul {
    padding: 0;
    margin: 0;
    list-style: none;
    position: relative;
}

.top-navigation .top-right .nav-item {
    display: block;
    float: right;
    background-color: #ffffff;
    margin: 0 5px;
}

.top-navigation .top-right:hover .current-page,
.top-navigation .top-right .nav-item {
    border-radius: 15px;
    background: #ffffff;
    box-shadow: 20px 20px 60px #d9d9d9, -20px -20px 60px #ffffff;
}

.top-navigation .top-right a {
    display: block;
    padding: 0 10px;
    color: rgb(0, 0, 0);
    font-size: 18px;
    line-height: 60px;
    text-decoration: none;
}

.top-navigation .top-right .current-page,
.top-navigation .top-right .nav-item:hover {
    border-radius: 15px;
    background: linear-gradient(145deg, #c3b9b9, #e8dcdc);
    box-shadow: 24px 24px 48px #b8afaf, -24px -24px 48px #faeded;
}


/* 主体 */

.main {
    display: flex;
}

.main .main-nav {
    width: 12.5%;
}

.main .main-nav,
.main .tabs {
    margin-top: 60px;
    height: auto;
    border-radius: 10px;
    border: 1px solid rgb(224, 227, 220);
    background: #ffffff;
    box-shadow: 22px 22px 44px #d6d6d6;
}

.main .main-nav a {
    position: relative;
    display: block;
    width: 100%;
    height: 40px;
    padding: 6px 10px;
    background-color: #ffffff;
    font-size: 1.2em;
    text-align: center;
    line-height: 38px;
    color: black;
}

.main .main-nav a:hover p {
    font-weight: 600;
    width: 100%;
    height: 46px;
    background-color: #c3b9b9;
    font-size: 1.4em;
    color: cornflowerblue;
    padding: 3px 7px;
}

h1 {
    margin: 0;
    line-height: 2;
    text-align: center;
}

h2 {
    margin: 0 0 0.5em;
    font-weight: normal;
}

.main .main_nav {
    height: 85%;
    margin-top: 60px;
    margin-left: -16px;
    width: 19.92%;
    overflow: hidden;
}

.main .col {
    width: 98%;
    padding-right: 20px;
    background-color: rgba(0, 0, 0, 0);
    max-height: 100%;
    overflow-y: scroll;
    flex: 1;
}

.main .col input {
    position: absolute;
    opacity: 0;
    z-index: -1;
}

.main .col:last-child {
    margin-left: 1em;
}

.main .col .tabs {
    margin-top: 0;
    border-radius: 8px;
    box-shadow: 0 4px 4px -2px rgba(0, 0, 0, 0.5);
}

.main .col .tab {
    width: 100%;
    color: white;
    overflow: hidden;
}

.main .col .tab-label {
    display: flex;
    justify-content: space-between;
    padding: 1em;
    background: #7ceae4;
    font-weight: bold;
    cursor: pointer;
    /* Icon */
}

.main .col .tab-content a:hover,
.main .col .tab-label:hover {
    background: #3758e4;
}

.main .col .tab-label::after {
    content: "❯";
    width: 1em;
    height: 1em;
    text-align: center;
    transition: all 0.35s;
}

.main .col .tab-content a {
    display: block;
    height: 52px;
    color: white;
    margin-bottom: 8px;
    text-align: center;
    line-height: 52px;
}

.main .col .tab-content {
    max-height: 0;
    /* padding: 0 1em; */
    background: #7ceae4;
    transition: all 0.35s;
}

.main .col .tab-close {
    display: flex;
    justify-content: flex-end;
    padding: 1em;
    font-size: 0.75em;
    background: #7ceae4;
    cursor: pointer;
}

.main .col .tab-close:hover {
    background:#3758e4;
}

.main .col input:checked+.tab-label {
    background:#3758e4;
}

.main .col input:checked+.tab-label::after {
    transform: rotate(90deg);
}

.main .col input:checked~.tab-content {
    max-height: 2000px;
    padding: 1em;
}

.main .main-content {
    overflow-x: hidden;
    display: flex;
    flex-wrap: wrap;
    margin: 70px 1.95% 10px 21.4%;
}
.main .main_content{
    margin-left: 16%;
}

.main .main-content .content-li {
    margin-bottom: 12px;
}



.main .main-content .content {
    width: 100%;
    margin-top: 10px;
    border-radius: 10px;
    background: #fbf4f4;
    box-shadow: inset 22px 22px 44px #d3cdcd, inset -22px -22px 44px #ffffff;
}

.content-iframe {
    width: 920px;
    overflow: hidden;
}

#iframe {
    display: none;
    width: 102%;
    height: 616px;
}

.content-iframe,
.main .main-content li {
    margin: 1.12%;
    border-radius: 10px;
    background: #ffffff;
    box-shadow: 22px 22px 44px #d3cdcd, -22px -22px 44px #ffffff;
}

.main .main-content li {
    /* width: 31%; */
    width: 386.4px;
    height: auto;
    background-color: #ffffff;
    float: left;
}

.main .main-content li img {
    width: 94.5%;
    margin: 0 10px 10px 10px;
}

.main .main-content li h1 {
    color: black;
    font-size: 16px;
    font-weight: 600;
    margin: 10px 0 0 10px;
}

.main .main-content li a:hover h1 {
    color: rgb(238, 61, 61);
}

.main .main-content li p {
    height: 32px;
    font-size: 10px;
    color: #9b9898;
    margin: 1px 10px;
    text-align: left;
}

.main .main-content .tit {
    margin-left: 20px;
    font-size: 30px;
    font-weight: 700;
    padding-top: 80px;
    margin-top: -70px;
}